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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c839c868be006caee6a518229fa48eb57ee2144be2cae69eceb14cf95964060' 
  AND token = 'drKU0YB4zte3CqtiRwBysKc9k0DSgzFa8LMIcy6kdaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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