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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ae2fa0ce5fee9e42aba7161751b53e82e70b50089855975bb85c79635e049c' 
  AND token = 'Y0yeLRnoE/7Y02EDqIL/tmFeuWpaY+/pt4+/iz3aZnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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