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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a81caeaf5a4b673e0a3d6022b650da5f05bf514b62722421f8bff632975e37c' 
  AND token = 'dju5tCjxubKV8SnQldq29SnrIfc+sC62MVE0iZlR9+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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