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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b00664da868d4b6a4948bda3ea33a2dcdaf0368c95d814b9dd09b6c5b8a16c9' 
  AND token = 'E8uSlIYlQKPEYolSijkDSgc+qELCii2whUE7g1lGtgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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