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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660bfade8be4dec21dec0a6922c3169b5f44bc7cc2cb5cbf0beac81373792ce5' 
  AND token = 'cv2kbSKzFiwKpXgJ+lQyPDjdAZS9vCEDnfq0+G5jozg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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