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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad707499be8f23bbb585ed76481eea986babd3467de7c097a4f7c69e1ab3fefb' 
  AND token = 'WHjp/WaWaQvw+fH9TmDlb/YvM/w8GVK0GTV3C4rVdzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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