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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71eb5f0ee63f184113b86209b113d7b075acdf4f4794628822bbb64f22d29426' 
  AND token = 'avl1vpnZEq+snmD3W124C4p7eYaLd1eN/1ezBKzFltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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