SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfd5d5ab773279b5ebaed70601087a2ec25c5dcdbdf9fca63d6d69b4a3949d7' 
  AND token = 'A0Rv/lwehOP+61YhqhwDqlKKpqnuSHh8NjFj5GmFdSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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