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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7eff5a38e9dfec3c18ab938ac00deabb9e9f24cacd1330812fa6a9d4c9b263d' 
  AND token = '/8cRo6DGS1zoGPhUiq2nLGApuX9PT6vf9UhQfA5jaas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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