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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb6b838fa1b141538d8a6ff2d83caa7ba60864bc23805b324620839aa5ba44f' 
  AND token = 'rQUcFr6tBrZl4qXSK0pr0nIlfnGGHkPxLOzBzKgQ7IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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