SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc00826f41b7ea28d8dd74fd7860e959a4b981c116df82d46fc2234bb0d7907' 
  AND token = 'vKwQHxhTVQozwOmw4w4jJE4xGRHPx6PsgG7qMlbQ1l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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