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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dc5f1994fa7b664ed3fe070ad2e88a5e6a63727c2f4a5bb628cd8c4af38ef2' 
  AND token = 'fn4qwqixrU0W6o4n7wTfHKlRpz4vKWYgSrmEQOnGPFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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