SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d9467f223feb017736f0d250b90bc49a06aea9ced274991f68ed0a0c2708ce' 
  AND token = 'lLv/hihAb719ZjY8qmuKDCwl/rWVfN7hg6nkjNzAhTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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