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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fdc1ce09eee0ca125820c665ad6528e85a3cb705595edf26f3d0f6aef4683d' 
  AND token = '65tyKjC99kzErYroQlaEo8mcht9EioFR3RaakinsLU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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