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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9d1cf47374d489846565aef3a5e41739353f15800585aa1f7fc900edf31f82' 
  AND token = 'cn7xwMUz/oiVk5KVP9q7ziN4EW9e6hDdkE2GOy1qF5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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