Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4fcc3502c52c271c3413479488cc91de22268e0b3ba5d3ee665ee1af06817f' 
  AND token = 'TvX/IFdaHJAGyGzeePUcvZy29kxf6Kb1dgw7WjjiHzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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