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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405f65e72eb45b3ffacc5c534843beb6385e213ad8b8c39213e0efa856325eb8' 
  AND token = 'ByfDRQx7OD6261yQgSG09QfseZJ33Pp7Rs6QZ/xYqno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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