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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbfd7e7e415ffdce6e1f3f194c9c3b24aebbf6ee6b1e58127507e97a565b717' 
  AND token = 'Of466sjpIzEjE114Wu72Bspv2CbTTuPx/NR6kFt1ZtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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