SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae2c44d22c58d58b33c80615ace8859bcb324b0a106a2572111c63d7ac72abf' 
  AND token = 'Rlvn0NY4vwWghpEVRf+0jU6vqoakPZm7WNYK9bHtn/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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