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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1a8e42097aceb9e976f2bd7e01e56100de6d1b64b75e64f48298a1dd6395d7' 
  AND token = 'pLjqIluAeN7QkptU8mjGqAre6MuuThHimbR0rE9FtIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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