Требуется оптимизация MySQL запроса

Всем привет!

Проблема: Выросла нагрузка на базу данных MySQL до 10000 CP (Лимит хостинга 2500 СР).
Вот тип процесса с наибольшей нагрузкой:

SELECT SQL_CALC_FOUND_ROWS `Section`.`id` AS `section.id`, `Section`.`type` AS `section.type`, `Section`.`contentType` AS `section.contentType`, `Section`.`pagetitle` AS `section.pagetitle`, `Section`.`longtitle` AS `section.longtitle`, `Section`.`description` AS `section.description`, `Section`.`alias` AS `section.alias`, `Section`.`link_attributes` AS `section.link_attributes`, `Section`.`published` AS `section.published`, `Section`.`pub_date` AS `section.pub_date`, `Section`.`unpub_date` AS `section.unpub_date`, `Section`.`parent` AS `section.parent`, `Section`.`isfolder` AS `section.isfolder`, `Section`.`introtext` AS `section.introtext`, `Section`.`richtext` AS `section.richtext`, `Section`.`template` AS `section.template`, `Section`.`menuindex` AS `section.menuindex`, `Section`.`searchable` AS `section.searchable`, `Section`.`cacheable` AS `section.cacheable`, `Section`.`createdby` AS `section.createdby`, `Section`.`createdon` AS `section.createdon`, `Section`.`editedby` AS `section.editedby`, `Section`.`editedon` AS `section.editedon`, `Section`.`deleted` AS `section.deleted`, `Section`.`deletedon` AS `section.deletedon`, `Section`.`deletedby` AS `section.deletedby`, `Section`.`publishedon` AS `section.publishedon`, `Section`.`publishedby` AS `section.publishedby`, `Section`.`menutitle` AS `section.menutitle`, `Section`.`donthit` AS `section.donthit`, `Section`.`privateweb` AS `section.privateweb`, `Section`.`privatemgr` AS `section.privatemgr`, `Section`.`content_dispo` AS `section.content_dispo`, `Section`.`hidemenu` AS `section.hidemenu`, `Section`.`class_key` AS `section.class_key`, `Section`.`context_key` AS `section.context_key`, `Section`.`content_type` AS `section.content_type`, `Section`.`uri` AS `section.uri`, `Section`.`uri_override` AS `section.uri_override`, `Section`.`hide_children_in_tree` AS `section.hide_children_in_tree`, `Section`.`show_in_tree` AS `section.show_in_tree`, `Section`.`properties` AS `section.properties`, `User`.`username`, `Profile`.`internalKey`, `Profile`.`fullname`, `Profile`.`email`, `Profile`.`phone`, `Profile`.`mobilephone`, `Profile`.`blocked`, `Profile`.`blockeduntil`, `Profile`.`blockedafter`, `Profile`.`logincount`, `Profile`.`lastlogin`, `Profile`.`thislogin`, `Profile`.`failedlogincount`, `Profile`.`sessionid`, `Profile`.`dob`, `Profile`.`gender`, `Profile`.`address`, `Profile`.`country`, `Profile`.`city`, `Profile`.`state`, `Profile`.`zip`, `Profile`.`fax`, `Profile`.`photo`, `Profile`.`comment`, `Profile`.`website`, `Profile`.`extended`, `Ticket`.`id`, `Ticket`.`type`, `Ticket`.`contentType`, `Ticket`.`pagetitle`, `Ticket`.`longtitle`, `Ticket`.`description`, `Ticket`.`alias`, `Ticket`.`link_attributes`, `Ticket`.`published`, `Ticket`.`pub_date`, `Ticket`.`unpub_date`, `Ticket`.`parent`, `Ticket`.`isfolder`, `Ticket`.`introtext`, `Ticket`.`richtext`, `Ticket`.`template`, `Ticket`.`menuindex`, `Ticket`.`searchable`, `Ticket`.`cacheable`, `Ticket`.`createdby`, `Ticket`.`createdon`, `Ticket`.`editedby`, `Ticket`.`editedon`, `Ticket`.`deleted`, `Ticket`.`deletedon`, `Ticket`.`deletedby`, `Ticket`.`publishedon`, `Ticket`.`publishedby`, `Ticket`.`menutitle`, `Ticket`.`donthit`, `Ticket`.`privateweb`, `Ticket`.`privatemgr`, `Ticket`.`content_dispo`, `Ticket`.`hidemenu`, `Ticket`.`class_key`, `Ticket`.`context_key`, `Ticket`.`content_type`, `Ticket`.`uri`, `Ticket`.`uri_override`, `Ticket`.`hide_children_in_tree`, `Ticket`.`show_in_tree`, `Ticket`.`properties`, IFNULL(`TVimage`.`value`, '') AS `image` FROM `modx_site_content` AS `Ticket` LEFT JOIN `modx_site_content` `Section` ON `Section`.`id` = `Ticket`.`parent` LEFT JOIN `modx_users` `User` ON `User`.`id` = `Ticket`.`createdby` LEFT JOIN `modx_user_attributes` `Profile` ON `Profile`.`internalKey` = `User`.`id` LEFT JOIN `modx_site_tmplvar_contentvalues` `TVimage` ON `TVimage`.`contentid` = `Ticket`.`id` AND `TVimage`.`tmplvarid` = 1 WHERE  ( `Ticket`.`class_key` = 'Ticket' AND `Ticket`.`published` = 1 AND `Ticket`.`deleted` = 0 AND `Ticket`.`context_key` = 'b' )  GROUP BY Ticket.id ORDER BY RAND() DESC LIMIT 12\G

На сайте 275К тикетов. Из обсуждений ранее делаю вывод, что требуется оптимизация MySQL запроса SELECT SQL_CALC_FOUND_ROWS. Про данный запрос в гугле есть несколько статей, но я там мало что понял.
Теперь вот хочу понять во что мне это обойдется (деньги/время/нервы) ?