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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3b413653c635df29ed5ccfcd5830f21ed8306951d0f83ff82b199d547b993f' 
  AND token = 'l2mDD+J+bGknXuaZ1ezSGAfp1pRmbJsNFKChZH2H18U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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