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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4700a1d4de74f3abd5737af3eb7fd78104daa63535d59194f0aadd3efccff2' 
  AND token = '4yCLRXJk02A0fPJs7AWDKVgZEmZ1BDClhuLKC8/v6G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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