Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5900858a9b267348f55460503bb2cfa2e0688740d35df41e69242991dab0a2' 
  AND token = '52IV9TpjA0VPi5n8MuCahQBfOiSYSP2xs9rYrjNFqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}