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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d58cf4e7592138ddf66c7eebe9553a944401eb258a1009797c9d0d27bb16a94' 
  AND token = 'pUtsFBtCI95Ul0lOexrs4YmQu/lK1+RPuW3nEnaQq8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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