SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9555d9b2e731ccd8b880365382584495a0a41a754acc6b225816224fed0f70c0' 
  AND token = 'IYjqlV40vDeVT+WwfQCRbgHWtWNgdplBP/3O9qKQzY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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