SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e0e57a62113bab6cc5fdce2a8f5de6acb12aaf6dc318b3baf708eec9784fd3' 
  AND token = 'GggGZCC9X8qEBmJw+A85UYsLl/lUne2YHJvBgKGYGm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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