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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22af323f5611b81185bd9b2106d6caa87b5705efbb6d9954eba88943840193a4' 
  AND token = 'VYxwxR5A8gWobhlbBLuefBbcFwEDTxOvKFdUgYagRcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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