SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6796b78b9968404ecef7e2efd06b2b769c9d70f016d40d3474585b3f815d0168' 
  AND token = 'C6j0uqg5J4EB9DggRpGjF/10D++ChWX3ssqN1+AivqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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