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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f9a614355b9d6385f7d2ccdc549bd6954c153b79983178dbe4638a4c37a0ec' 
  AND token = 'PRYEz4tDibyV95o4N+bs9YAyPPiajeZcI2A0trZ528U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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