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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d8c99dcc1ad4fbc3e5d131a958a5b720dcb80ae6b033ebd8a7db5b82d7b9f0' 
  AND token = 'lZY4yZE1SGcoJbMVm+WHu7HMGBmajxfs7LJ+VUrfQJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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