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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9617a272e23480c666dd4b07c99bdc17f12d7a746b5081bc614ac865aec86163' 
  AND token = 'dQJ6McAkIlrY3nsf7wtfwjagB5GOfPCa6wHW8mf4BIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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