Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f2ef2ea2d32a630065944c8c9afc2826d9be79f30d047c827c725a8890fb60' 
  AND token = '1588FAlm+ASGIFu4yBCUv/klG+uMbVRpWc6iP8L+dBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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