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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f7fc40d09a79de27923d5bc69c1938d8815e9d31492d046bed0d71491dd20b' 
  AND token = 'Noj3iNZEY9s/0frFCpIZmvNFrjuNww6Ga7FMmjzn/Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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