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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ad65a76a9e08c61628c64d8fa6deb5b7094b639d920163c546cbe3b292f415' 
  AND token = 'N82KT5DCP4KNj7RluHOivo5mY7nVf5MgAq8rXkXXhA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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