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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0300f7322d6ddbb6d1ab53722d43b665c06d7f869b9a3a96bc6d3387dbffb3a' 
  AND token = 'BjS8n4CnbGaUI6N6okNTl1lom2D6FgLW6yQfIc7us+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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