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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f867482737c509acf0b3b836e4af13971f2dbae394d988fb9cfd91a305c712dc' 
  AND token = 'hajFMmV3NMY/67PqsY7iVvQDv3ekO5Daewkt+hB93eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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