SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2283c5fb777bd34e58c76495f39f6102d0e4a8ab7953580da2320e73d12f33' 
  AND token = 'yihYOdtj8hzTm1zRcVU/klCQlJURDcwBuQzDGWnB4tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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