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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28848423c50fcebfdb3d91eb5da891e2f58612959304529d8bf7004ce1c28ffb' 
  AND token = 'URPAHfdr8Ew2B08TU4Evd/BR+5MlzNZbB6SANkATP5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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