My level of creatine kinase, total, serum @ 980 no muscle or serious injures. Why so high?

Need more info. Creatinine Kinase may increase in many illnesses. To adequately answer your question you have to speak to your physician who knows your medical history.
Over exercise? It could be due to medication you are taking or over-exercising. That level is not high enough to affect your kidneys most likely. Increase your hydration. .