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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5fd469c2a9a24e7f24a671ee3d5f375364968fd14eab583e5dfbef4b0bb891' 
  AND token = '9S4yHv83bO//XaFft5PPuJ2QpXLt/ukLH+pXAWNVLzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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