SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb898c0b183fb0c9064fcc831857bd4c2cb8bf9dadd582e0170831f3a3a8d65e' 
  AND token = 'FSQUUR+Y+hRqnbZ0JLSN1qz1wt7iwqhGDghUjs8TKUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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