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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75a3f40b19b25807ea11a8f7398a05cbf5e6d46358ba828d6677abe752614f3' 
  AND token = 'ylHwo/UWLdGcAchbaJCuk9bcHgwxrOh/N5AjI/chTww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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