SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a8c1784aa387134de18dac352a24966c8031132b06d05944f84657a027d611' 
  AND token = 'IC7Wb+V9LVfgIY44YHzTNbYkASyLLl+qtJuMqneBZrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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