SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117b877306e325d13c30c9555bda5204848599d2126282f64d74c3c29a2a78cd' 
  AND token = 'kgPnj7QvbmvBpBz/DJJTcZu8LMJitU7qQPw/+GnMg+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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