This is a YAGNI concern, it won't make any difference if you are doing that check once (or a few hundred times) per frame.
But since you asked,
IF myBoolVar THEN ...
' is a bit faster than
IF myIntVar > 0 THEN ...
' or
IF myBoolVar = true THEN ... ' why check "=true"?! good for readability, not so much for speed
The difference is a part of a microsecond and will become significant when you start doing that thousands of times per frame.