Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70aac45fa639a7c78c146fcb105b3628d2544b640d8acb2a1823e710e1d9ad8' 
  AND token = '8A30S/p/vf5kUT3AiMZRixVvZdFysAEXyc+5t4KCBAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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