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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11269c7887718430bbf5534a7eadd589b7312406d88974f33fe73b8940b8c92f' 
  AND token = 'ed3fWxaxMixnseAbwbOsYlxpKpXjO7E3rhUp3lR0S14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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