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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb3856d809b97e8a54b7459cb99e58eaa07ec11a84fa3859e318b0d93dd0119' 
  AND token = 'dv0CwROgrxJbJzq8qeRXrEuK/SC8a53ypk7sJ+EjoWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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