Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e574a216b476638c940bec453022e39833e31763aa2ce9996ef73b00cf35ee' 
  AND token = 'x+JHjNlC3jCrw9gFd5tk2oxViuV0bLjQGNqZRRF3BjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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