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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab7c36bcda2b66cbdcf4a55e590c54e255fcd9a634ae6b3c9fa6fb9c4f24162' 
  AND token = 'rle2GqhwkPy0+GwjYfynSVn3ZURbKlYJndkDruE0fkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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