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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689fac00735cdca3ad7a3fae2b08d240a065bc4370d9c6293f41c5119d21317a' 
  AND token = '5jzrU5XsugQak8KuFa6D2zO0p9doDdwAIcmnFhdZkZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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