If anal toy was used on me is there risk of std? Not sure how clean it was or how often was disinfected but it was not used directly after someone that I know of am I at any risk?
No, if there is nothing on the toy, there can be nothing transmitted to you, anal fissure or not.
STDs die pretty quickly once outside the body, so sharing toys isn't usually a risk. This is more of a theoretical risk, like it could happen, but if there's any time at all between use between partners, it won't transmit anything.