SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da0134295d6ccbf23b62aa416c3bea1ea43102796d86cab066a5f85473d5876' 
  AND token = '6+NDcvJ+YqGJzBWw09eh/FfmAl/GnjSEH4n/VzZ6C/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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