SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c833c8db486215456a948075210a38b2df4dd86d343c93bdc7d7a412743f23' 
  AND token = 'ixjuWtnX2b/LdzN0JTlmQo3q1HzQFRDVv+vbu98WhMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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