id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	cms_tree	ref	PRIMARY,site_code	site_code	45	const	68	Using where; Using index; Using temporary; Using filesort
1	SIMPLE	cms_content_element	ref	tree_id_2,tree_id	tree_id_2	5	avalon_www.cms_tree.id	3	NULL