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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82386cb73ff80e1317c000e36e059f625d6a61b4b05b080c6c3276b2f9410d85' 
  AND token = 'jEl5c6NqxK/zRzKz6L/FCLJR2asbfl6rdzfpDvqHqWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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