SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa9909280a28567450573c4baecf265bbab86722f8908603d3b086749645bc5' 
  AND token = 'v8WEgtKujxMdR+SG6RHHDYV0S9PSJkLDJoqp+37G1CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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