Best way to check if an image is an assest/IContent

Is there an API function to check if an file in a container has a corresponding IContent object? 

I would like to check if, for example, the file 'd5f5d04f0a2a4279abea2d1e2edcef6b/6598d114649f403494a5e39ae0e52e12.png' is an asset/media in use in Episerver.