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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7b83bdcc6f2ddea7ff0c542f1d8a4b95718691dc9659ec578ee9d7db1decdd' 
  AND token = 'nmjJIv+N8OI50QmXpDahEzNV5pgyguLt7Hn1eALY6mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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