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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8196f386fa7e2621c67d1e85fc55f2eea5eb3149036b47cf6acb993d3d1bf9ba' 
  AND token = 'xE1spBXN/pd2wfhlV/vyMkRh6AOxfc9AiBusKsDZLRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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