id	select_type	table	type  	possible_keys             	key     	key_len	ref                  	rows 	Extra
1 	SIMPLE     	t    	ref   	PRIMARY,forum_id,last_post	forum_id	2      	const                	25443	Using temporary; Using filesort
1 	SIMPLE     	p    	ref   	author_id,topic_id        	topic_id	4      	wmonline2.t.tid      	5    	Using where
1 	SIMPLE     	m    	eq_ref	PRIMARY                   	PRIMARY 	3      	wmonline2.p.author_id	1