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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaf8cff40368bf0d3f807d1289462a2661ed4e4122b97861713d8f8b0793adf' 
  AND token = 'qrLym9P4P8LYHclhqX24PQJHM/jdIvudFOnHId6v3ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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