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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25860458ff7ab57bd2f99a53f1d7f3bff315ce1027dbe7c9d51707901aaa477' 
  AND token = '3tl0xH3t+Ha8YwyQpK/Ot4w+c3KKV/WMmI6HmNNGu4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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