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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87de30fb5a4084b36d4a6fa529a7d5d8362c28f4022610c01e2f5f2673619f00' 
  AND token = '97garAmAogZarFee627WDenvPUoVl72MryAR8gschng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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