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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4fc5952ae09c4de52f724cbf561e0b47e0b9b667d6da524f4a4e73ab980204' 
  AND token = 'uSm28mztEzDQfi/ztuT2VEKaf/yjN4Re4IlosDIrsfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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