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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e2bd45d3efcb2593f60d8ca20aab267032cb8b1631263fdfb810c768bf374d' 
  AND token = '9G6JRkp5XhOF4AtY0rD+C6nbfaitb5lzU9RhaSSwpzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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