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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b842d63f1cc4ac7ca1b542f78ecd4fb40a97cdc90ca6c894873cf188e8e83a93' 
  AND token = 'G1Vytz0A3zpmP2wE5C3LxlgNulaxV84PC7RLng2sL/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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