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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c17f17b7d5c0572bbe552c8bba2ae11baabc5ffdfa39577a9ee3b412b0907cc' 
  AND token = 'b8coccrGh4GNTK3/vxK0/MHlXOIBHrNSeCfEU2JHVNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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