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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a58389332520cae593559b3dae0a0a3ed959d4ec0da4749fc4dc6e2e7cea25' 
  AND token = 'JOxKJ2S8ksJKm0d1B829+bvl9HYb5UH2JTI9H1yHaFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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