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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd605b720b55f2bed3b8bf87cc3eda870ab774a19a684a8c4e0f1a21e04f455ff' 
  AND token = 'M4hiabDjsKmxLu3pdTT30rx0CJG5bzOeBx4wHIA5TPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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