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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891120adb231bb20124b1d268fb01a3f8ee2453631230e2ea2d12cf104980dbf' 
  AND token = 'NnVBGNord8cP7LWmO7W87q8YDRDu9efqjBuua2gCMVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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