sql joins with or logic - performance

SQL requests from .net app where joins have "or" logic

Select aa,bb,cc,dd from parts inner join secmast on secuser= ?
and (secmast.loc = parts.loc or secmast.loc = ?)
and (secmast.type = parts.type or secmast.type = ?)
where parts.desc like ?

Visual Explain is showing over 1,000,000 ms in Final Select
v6r1

Is "or" logic in a join an issue? Their app allowing
user to select a single loc or "all" locs, same for type.
Jim Franz