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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e38c0f4f95086d59e5de6ac98b689e2fb82856967ede885526bf8aba88b7d5' 
  AND token = 'tdP5Zu2iKGKpwj9k0wiV3rfWGEEug9SbxWWcNlRj280=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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