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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd72b4e6ff044c6ac4c32c5dfdc7cec5912e0a3bf67908d1992dfa2395bf08e1' 
  AND token = 'gSsptNu/xfq959gGMV1OmMGDfBnW/4AFdbbtcB8FjfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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