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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2975722fa16a5ab34dd61e64ec0be0ab9010790939d15707001d2283b343a90c' 
  AND token = 'pYPs1V1IpWysSaxPxT7RAJqyTBUoocq+pxTP6AaCG9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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