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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d634d2d72a180d6cf5c602b3449b90124f5a2dcacc45b651d8a015e3a0823ee' 
  AND token = '83nv9Q7mFBDp0Ec1E5FYNeSfsSUvF9N6NzfYscZCkng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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