Happen to (in questions)
Normally you wouldn't translate happen in questions like the one you proposed.



But, if you really wanted to - the best equivalent I can think of for doing this would be by adding:


  顺便问一下


at the beginning of a question.

So your question would end up being something like:


  顺便问一下，你有没有眼镜护理螺丝刀呢？