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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201088d77c3a34cd4a6282ba115afd358a33f55af63e8e52cbaa3fd5c6a2fb1c' 
  AND token = 'Qo1db7fyvr5BETe8bCnNMkHJM0OnKItJqodE9LG+vlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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