Is there luggage storage service in Kunming airport and how much?

I have return flight from KM to Xishuangbanna departing at 4.40 pm, departing Xishuangbanna for KM at 7.40 pm. Is there luggage storage service in KM airport such that i can save time checking-in for the flight to KM from Xishuangbanna? If this service is available, how much does it cost?