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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea482a2133ac61cc0eb085f7f34038538f89a2333bc539d19c2d49873d82dfb' 
  AND token = 'ndHw9Lko93q7IwHLwS1etFXFSoi6BpIhepszruwPHKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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