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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adb222c97eab94153080e937bee8fd9e5130b94222d37e10d282a550705cd32' 
  AND token = 'KNpP4GO6Mu8wx89xAf8KZNbXa0O8qFj25MjuKjGetDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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