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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c586bd5a726764f50630c6f5a715f5f209e195709b2d24f1c084f737e4bdd91' 
  AND token = 'bgLFRsLv6aGGZbiIrk7yXR64SwRp158Tmd5DKCQvOxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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