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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c607ae2ae9df4b34175509cd85cba16c86566906e053bee1a8c6c0689516fd' 
  AND token = 'mFz5CaVioJzHldCghFXw7uFJ7k5ryoY6/Y9COe7+pRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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