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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f55ce8cdb7f14af956295be60f70a347856ed9b5e3721b0269e8f24535dc59' 
  AND token = 'iDfKZU9yGU9Ovtt30Pl0Y1MRVixcco6EWGsgZQNjSBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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