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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033b583259d3a895f8a3ddba53170e41823d6977aeca8aef6ade3576f4c99a7d' 
  AND token = '09jMQcUzlIZuyt3o5LFmGofTWZ9ied5Ua9tVOGc5F5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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