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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec38de463443cdc402d43c6d8c94c8ea3c4e3fc989a4b65b5be4303ea7ec880' 
  AND token = 'IMAjeXhi9jz34uI5GJGaFqshT5L0MqZFFEVNtS6WLfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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