Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18199d8db6673fbf0526c4670890b701ccd3f7b635d4fc0726867d385c339f1' 
  AND token = 'axcmcC/qod+qL9g+d0qN9mhRrfd2SiiPUigwP4x75Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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