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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e30a41808eb9d4e1ddf58591d9e539c673176c415e9905bbcd9a30d3a8c10e' 
  AND token = 'fdEOeGy3B8Qs4VFyq2Q//A/Yxi5Fw4+xZBTb0HXmaFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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