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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbd857dabcfb1f442ccac91c86a82ec6d4e8290a4548cd5a3979c57da880e1c' 
  AND token = '9NY1xWfW6j697WZxulxW6u1YVNjbP8uuix7DwTlOPoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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