Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a140fa24913ea2ea30acf0662a1ac17bf715a20f5ac23171c8d8257ae0d66bad' 
  AND token = 'bNBYz9kP3cIdRxAdmiUp0Kwe8i8xKklLsmkjTaWm/dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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