Yes, it is by lastpost as you can see from the query (note the ORDER BY clause):
SQL Code
1 2 3 4 5 6 7
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SELECT t.*, tfd.`cl_` AS `xthreads_cl_`, tfd.`sl_` AS `xthreads_sl_`, tfd.`hrn_` AS `xthreads_hrn_`, tfd.`hrp_` AS
`xthreads_hrp_`, tfd.`bp_` AS `xthreads_bp_`, tfd.`bpj_` AS `xthreads_bpj_`, tfd.`tow_` AS `xthreads_tow_`, t.username AS
threadusername, u.username
FROM mybb_threads t LEFT JOIN mybb_users u ON (u.uid = t.uid) LEFT JOIN `mybb_threadfields_data` tfd ON t.tid=tfd.tid
WHERE t.fid='24' AND (t.visible='1' OR t.visible='0')
ORDER BY t.sticky DESC, t.lastpost desc
LIMIT 0, 20
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If it's "cl_", then you need to use that as the key, ie sort by "tf_cl_"