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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea7469a90ff38e994231bf148aae322fe32cca22184070e3e879ec13ce4f07a' 
  AND token = 'qS9EeTlWRn1QY9CFUfqfbM/H4oMph/IPW06wg9Pajwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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