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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d10bcdae52b469e930c7b923bb04a3fc5ff6573c7cc1871f7b3ceeab41ee49' 
  AND token = 'h3BQ+o+NrPmJbAJyxmUEKtEGgezjkPXc0yumpWIIfeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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