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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cf7c5096fcc97abe5c216416ed31eda9222a12e525198a255fc2f8252a167a' 
  AND token = '/vfdEOlgMo/K0PiMAVZF3bErJfOyo2a6k/ygHlBAQiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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