Many good online search sites can answer the question as to whether or not you have a warrant outstanding. Even the San Diego Sheriff's website has outstanding warrants and can be checked. Generally, you want to check a statewide website, not just Las Vegas.
But, here's the twist: there may not be a warrant but there could be an old case on which you failed to appear or have some other problem outstanding, and a warrant was not issued. That could come back to haunt you some day.
Be careful. If you just want a yes or no answer as to whether there's a warrant, that is easy. If you want to know the status of a case, that is far more complex.