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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ddb061808ec72620d3b87e667ec9db3f04f1619680f4925eb4e9d229fa67e4' 
  AND token = 'MYG5WWqhmiF923Sj8B9vFvBED6gVRPBNKcdWZ55Qo90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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