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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d219269fb9d159b29e6e756bd25fef969220a65b3a1d06fc6165c36061e992' 
  AND token = 'lO3YuHxmaj8cH18/KiFkQmGnDTBvbRlnPL2hAo1WLpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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