是的，It 为形式主语，pays在此为不及物动词。不定式短语为真正主语。for介词短语为不定式to check的目的状语。

《韦氏高阶》pay

 to have a good or helpful result : to be worth the expense or effort to do something

[no object]

— often followed by to + verb

• It pays [=it is worth the effort] to study your notes after every class.

• When the roads are icy, it pays to drive slowly.

• It pays to advertise.